chore: finally do some work

[NotAussie]

First off, Cloudstile needs some house keeping, I've realised that pydantic might not be the best idea, so I intend on researching a migration to something like attrs or an internal class system to drop another dependency. (the less dependencies, the better)

Chores:

• Re-drop support for Python 3.9 #22
• Possibly replace Pydantic
• Add checks for Python 3.14

Also thank you to @HakaiInstitute for using Cloudstile, it's always so nice to see my random helper library be used by an established project!!!